Final answer:
Reflection symmetry, also known as bilateral symmetry, describes a form of symmetry where an organism can be divided into two identical mirror-image halves across a single plane, resulting in clear left and right sides.
Step-by-step explanation:
The type of symmetry where identical halves can be reflected across a vertical, horizontal, or oblique line of symmetry is known as reflection symmetry, also referred to as bilateral symmetry. Bilateral symmetry implies that an organism can be divided into two equal and mirror-image halves by a single plane. This plane can be vertical, horizontal, or even diagonal, effectively producing distinct left and right sides that are mirror images of each other. Examples of organisms with bilateral symmetry include butterflies, crabs, and the human body, all possessing a distinct head (anterior) and tail (posterior), dorsal (back) and ventral (front) ends, and right and left sides.